The school was founded in 1889 when Frederick Gibson bought a school run in Papanui by friends of his, Ada, Kate and Jessie Gresham, who were moving to Australia. The school had 18 students, aged 5 to 16 years old. Initially Gibson's daughters Alice and
Helen and their mother Mary ran the school, calling it "Miss Gibson's Private School for Girls". In 1891, the school moved to a building in Webb Street and was renamed
Rangi Ruru, meaning "wide sky-shelter". This name had been suggested by a
Māori chief of Rapaki Pa,
Pāora Taki, a friend of Frederick Gibson. Helen Gibson continued as Principal and her sisters Alice, Ethel, Ruth and Winifred joined as teachers. Under Helen Gibson's leadership the school roll grew, reaching over 200 students at the time of her death in 1938. The Rangi Ruru Board of Governors was established in 1946 when
Presbyterian Church members purchased the school from the Gibson family. While the Christchurch Presbytery approves appointments, the board is autonomous. In the early 1980s, the school wanted an on-site chapel, while simultaneously the congregation of St. Andrew's Presbyterian Church at Hospital Corner was declining. It was decided to relocate the church to the school site, and in 1986, the building was moved to land adjacent to the school on Merivale Lane. The church became known as "St Andrew's at Rangi Ruru". == Enrolment ==